"A" and "B" grade are just sales/marketing terms with no technical consistency. It's a meaningless term. It's like a company putting "Pro" on the end of a model name to make it sound better.I was reading up on Grade B and as I understand it, they are the cells off the same production line which failed one of the far higher standards tests required for EV use and then get grade "B" and resold to the likes of Ali*
"A" and "B" grade are just sales/marketing terms with no technical consistency. It's a meaningless term. It's like a company putting "Pro" on the end of a model name to make it sound better.
When buying cells just look at their technical specifications to assess their suitability.
But the only way to "continue charging" is with a higher voltage.At that point if you continue charging you will be lithium plating the anode - causing irreversible capacity loss and seeding dendrite growth that will lead to premature failure.
You can argue about how severe
Here is a doc from 2012 I believe describing the issue of keeping a cell at high voltage for prolonged periods of time. Note that some of the terminology/etc. reflects the time this document was written:
In the broader sense I agree. However. (There is always a however and a depends?).But the only way to "continue charging" is with a higher voltage.
Not sure I understand now this "low current overcharge" happens if your charger is set correctly.
Low current overcharge is when the anode is full, and while the voltage is still at 3.65V lithium ions are now being plated to the anode as they cannot intercalate.But the only way to "continue charging" is with a higher voltage.
Not sure I understand now this "low current overcharge" happens if your charger is set correctly.
Low current overcharge is when the anode is full, and while the voltage is still at 3.65V lithium ions are now being plated to the anode as they cannot intercalate.
As you say, it cannot happen if your charger is set correctly. Experience has shown that under 3.5V will be a low enough voltage to prevent it.
and the alarmists are saying 3.4V is too high...
Hahahahaand the alarmists are saying 3.4V is too high...
It is way more efficient than Pb chemistry. As mentioned earlier, with a correct setting when current tapers to a set current a charger should shut down and there will not be wasted power. I am not sure what that has to do with the topic of "low current overcharge"?The cell charging process itself is not 100% efficient. The losses go up with higher voltages. At a point a cell can reach an equilibrium with it's supplied voltage. Just as you suggest. The things is, the current is not zero. If the cell at 1 Amp has 1 Amp of losses at that voltage, then it will sit there "wasting" 1 Amp.
It is way more efficient than Pb chemistry. As mentioned earlier, with a correct setting when current tapers to a set current a charger should shut down and there will not be wasted power. I am not sure what that has to do with the topic of "low current overcharge"?
I am getting the impression that this low current overcharge actually is a non-issue, as long as we stick to the recommended charge profiles. Most of us even charge more conservatively.Mine are in use. Charging and discharging everyday. Charged with 56 volts float at 54.2 volts. Divide those numbers by 16 and those are the cell voltages that all 32 of my cells exist at. Does that mean I don't give them an opportunity to low current overcharge?